Tap-holding chuck for nut-tapping machines.



J. A. JGENSTGN.

TAP HOLDING CHUCK FOB NUT TAPPING MACHINES.

APPLICATION FILED DEG. 20, 1910.

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TAP HOLDING CHUCK POE. NUT TAPPING MACHINES.

APPLICATION FILED DEC. 20, 1910.

Yat-nted 0ct.13,191-.

2 SHEETS-SHEET 2.

inventer:

' with the located at the end of the chute 2; and op- UNITED STATES PATENT QEFXQEQ rer-nonnlue entree: 50R: nun-merino meonmns.

Specification of Letters Patent.

Patented use. is, ieii.

Application filed Beet-inter 20, 1916. Serial 110. 598,485..

To all whom it may concern:

Be, t known that l, JOHN Arnxsnnnn Jormsron, of '74 Bruce avenue, int-he CllJX of Montreal, in the Province of- 'Quehec Canada, a- Ganadlan citizen, have 1 vented a' certain neeand useIul Tap-Holding Chuck for Nut-Tapping Machines, of which the following is a specification.

This invention relates to jautomatic nut tapping machines and comprises an improved tap holding chuck for use in nut tapping machines of the type wherein a tap having about shank is employed, andpvherein-nuts are fed progressively along said tap and its shank, and through the chuck.

The object of the invention is to provide an improved chuck for nuttapping n1achines of the type referred to.

The accompanying drawings illustrate, one form of machine embodying the invention.

In said drawings: Figure 1 shows 5*. longitudinal vertical section of the machine; Fig. 2 a detail elevation and partial section of the screw tap and nut-guide; Fig. 3 is an end view of the chuck cap; Fig. 4.- is a transverse vertical section of the machine through the feed chute; Fig. 5 is a 'transtl verse section of the chuck; Fig. 6 is an eleva, tion of the tap holder; andFig. 7 is anend View of the tap holder.

In the drawings, 1 designates a hopper from which the nut blanks to be tapped. are fed, 2 designatesa-chute into Which the nut blanks are delivered from the hopper and which conveys said nut blanks to the nut holder, and 3designates a vertically reciproeating nut feeder having an oblique upper surface and provided in said surface with a groove 4 of a width adapted tov hold the nuts edgewise. Thisfnut feeder reciprocates up and down, through an opening in the bottom of the hopper, in guides 5. The means for reciprocating said nut feeder will be referred to hereinafter.

6 designates a driving shaft, mounted in suitable hearings in the frame of the machine and provided with a belt pulley 7 whereby it may be driven. Upon'this shaft 6 is mounted the chuck 8. In axial line said chuck there is a nut holder 9,

posite this nutholder. and mounted to slide in an orifice in 'the frame of the machine, there is a plunger 10, reciprocal-ted as here-' .inafter describei andadapted to force the hut blanks successively into the nut holder. Within the nut holder is the screw mp, 11- this. tap being extended at its rear end to form a guide for the threadednuts, the said guide being bent as indicated particularly in igs. 1v and 2. The chuck 8 comprises a tap (Figs. 5" and 6),; having in it a curved nut-passage 3,3,c'1iri7ed so as to discharge the nuts at the periphery of the chucltg and u'ithin this curvednut passage fits rear end of the tap ll. i3 is open on one side, so far as thetap holder is concerned such openside being normally closed by a removable chuck cap ll normally he 'n place by means of screws 15. A flat spring LG-emhedded a groove in the chuck cap, engages the nuts as they reach the peripheral opening of the nut passage 13; holding the nuts successively ugainst'dischawe, until they are positively pushed out bythe nuts behind them. he port ion of the chuck in which this peripheral discharge opening is located is surrounded by a channeled casing 17 forming a part of the frame or machine, and leading to 1 a discharge openin'glS.

l9 designates a cam shaft 3 by meansof gears 20', and upon this cam shaft ismounted face earn 21 for operating the plunger 10, also another cam 22 for operating the nut feeder 3. Cam 21 operates a pivoted-leverfiia, Working against a spring mounted upon the plunger 10, andengaging, on itsrear side, a nut 25 carried by that plimgeigwherehy, as lever 23 is vibrated hycam 21, the plunger 25 is first Withdrawn from beneath the feed chute 2 to permit a nut blank to drop from said chute in front of the is thrust forward, pushing the initagainst the end of the tap. Since this'gtap is revolving, the nut, so forced upon the tap, is threaded and thendpasses hac'kward along the tap, 'pushing hefore itthe nuts pre viously threaded and mounted on said tap. When-first starting the machine, the chuck cap 14. is removed, andthe tap ll is put in place, and to hold it central with respect to. the chuck, enough nuts are mounted upon the rear end of this top to fill the nut pas- 13, shown in Fig. l. The chuck (up is then replaced, the hopper filled..- and the machine. started in operation. As the nut feeder 3 rises through the mass of out holder 12 This nut-passage shaft driven from blanks within the hopper, several of said nut holder 9, and then the-h nt blanks will be caught in the groove 4 in the top of the feeder, and when said groove is opposite the mouth of the chute 2, (Where it remains for a short time, due'to a. dwellprovicled on the corresponding portionof' the cam 22) the blanks so held in said groove. will slide intothe chute 2] and will -fall down said chute to the'end thereof;- here they are held by the plunger 10. At a time determined by the cam 21, the plunger 10 moves back, so. permitting one nut blank to drop from the chute 2 in front of the nut holder 9, and then immediately the plunger 10 forces this blank upon the end of the tap 11, holding it there a sufficient time so that the tap will fully engage said blank and start the thread therein. It is not necessary that the plunger hold the nut against the tap until the blank has been completely threaded, and when the thread ing of the nut has progressed sufiiciently,

' the plunger 10 is withdrawn, another blank drops in front of it and then this second i blank in turn is'pressed against the end of the tap; and so on. As the nuts are threaded, they are forced back along the tap, and in turn the nuts already on the rear end of the'tap are forced past the spring 16' and fall through the channel 17 out of dis .1 charge opening 18. Since the plunger 10 is driven forward through fthe spring 24, if.

by chance a blank should jam infront of this plunger,-no breakage will occur; and

an opening 26 is provided-through which any nuts which may jam in the machine may be removed. As indicated in Fig. l, the end of the plunger'is bored to receive the tap, so that the tap may not be injured by contact with the end of the plunger.

7 The bent rear end or shank of the tap affords means for rotatingsaid tap by the action of the chuck, while at the same time permittihg the nuts to be fed backward over 'said shank and through the chuck, con

tinuously.

-Wliat I claim is A tap holding chuck for nut tapping machines comprising in combination a main chuck section, a tap holder removably secured thereto and having Within it a crooked nut passage open at both ends and at one side, and a chuck cap closing the open side of said passage.

In testimony whereof I have signed'this specification in the presence of two subscribing witnesses.

JOHN ALEXANDER JOHNSTON W'itnesses:

CHARLES W. Horn, Cues. F. DICKERSON. 

